1) Display a shimmer of colors 2) Exhibit a play of colors 3) Exhibit milky iridescence 4) Exhibit shimmering colors 5) Flash colorfully 6) Give out iridescence 7) Have a milky shimmer 8) Reflect 9) Shimmer 10) Shimmer colorfully 11) Shimmer iridescently 12) Shimmer mercurially 13) Shimmer with color 
• (v. i.) To give forth a play of colors, like the opal.
O`pal·esce' intransitive verb [ imperfect & past participle Opalesced ; present participle & verbal noun Opalescing .] To give forth a play of colors, like the opal. 
[v] - reflect light or colors like an opal 2. [v] - exhibit a play of colors like that of an opal
to exhibit a play of colors like that of the opal.